US4037974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sample cell for spectrophotometers
Assignee: Individual
•
Filing: 1976-01-12
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Granted: 1977-07-26
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Expires: 1996-01-12
Abstract
Abstract A sample cell is provided for spectrophotometers which is constructed to prevent stray light from being carried to the detector through the wall of the cell. This is achieved by configuring the cell wall in a manner so that it cannot function as a light pipe for the stray light, or by providing light attenuating means in the cell wall, or by providing an appropriate masking means in the wall.
Inventors
- 👤 Taylor C. Fletcher
- 👤 Bruce L. Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:47
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/03; G01N2201/00; G01N2201/06; G01N2201/064; G01N2201/0642
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
A sample cell constructed of a single homogeneous material for use in spectrophotometers having an entrance end and an exit end through which a beam of radiation enters and leaves the cell and passes through a sample contained in the cell, the cell having a transparent side wall, a first window at the entrance end integral with said side wall and of the same material as said side wall, a second window at the exit end integral with said side wall and of the same material as said side wall, and said side wall including means for minimizing the passage of the radiation through said side wall from the entrance end to the exit end of the cell so as to obviate the formation of a light pipe by said side wall.
Claim 2
Dependent Claim
132 words
A sample cell constructed of a single homogeneous material for use in spectrophotometers having an entrance end and an exit end through which a beam of radiation enters and leaves the cell and passes through a sample contained in the cell, the cell having a transparent side wall, a first window at the entrance end integral with said side wall and of the same material as said side wall, a second window at the exit end integral with said side wall and of the same material as said side wall, and said side wall including means for minimizing the passage of the radiation through said side wall from the entrance end to the exit end of the cell so as to obviate the formation of a light pipe by said side wall.
Claim 3
Dependent Claim
35 words
The sample cell defined in claim 1, in which said means includes an outwardly curved intermediate section of the side wall for reducing the internal reflectivity of the side wall below the critical angle thereof.
Claim 4
Dependent Claim
34 words
The sample cell defined in claim 1, in which said means includes a sawtooth-shape outer surface of the side wall for reducing the inernal reflectivity of the side wall below the critical angle thereof.
Claim 5
Dependent Claim
21 words
The sample cell defined in claim 1, in which said means includes at least one frosted surface on the side wall.
Claim 6
Dependent Claim
46 words
The sample cell defined in claim 1, in which said means includes a coating on at least one surface of the side wall of material of an index of refraction lying between the respective indices of refraction of the side wall and of the surrounding medium.
Claim 7
Dependent Claim
20 words
The sample cell defined in claim 1, in which said means includes a radiation attenuating material forming such side wall.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |